Final diagnosis


Alternaria leaf spot on tomato (A.linariae)

Young brown to black spots, more or less rounded or sometimes angular when delimited by the veins, on tomato leaflet. <i><b>Alternaria tomatophila</b></i> (early blight)
Detail of some necrotic alternaria spots on tomato leaflets. Note the yellow halo and the concentric patterns. <i><b>Alternaria tomatophila</b></i> (early blight)
Eventually, the leaflets dotted with numerous brown spots turn strongly yellow, and eventually dry out. <i><b>Alternaria tomatophila</b></i> (early blight)
Older angular and necrotic spots, a more or less bright yellow halo surrounds them (due to the effects of a toxin) <i><b>Alternaria tomatophila</b></i> (alternaria, early blight)
Several alternaria lesions have formed on the rachis of this tomato leaf. They are elongated, clear in their center, and dark brown to black on the periphery. <i><b>Alternaria tomatophila</b></i> (early blight)
Detail of alternaria lesions on tomato stem and petioles. Also note the concentric patterns. <i><b>Alternaria tomatophila</b></i> (early blight)
A large off-centre lesion invades the stem area of ​​this tomato fruit. The affected tissues more or less collapsed and took on a brown to black tint. <i><b>Alternaria tomatophila</b></i> (early blight)
The stem area of ​​this fruit is extensively rotted. The fabrics are collapsed and pleated concentrically. <i><b>Alternaria tomatophila</b></i> (early blight)
After invading the sepals and the peduncle, <i><b>Alternaria tomatophila</b></i> colonizes this fruit and causes a circular brown to black and depressed alteration (alternaria, early blight)
It is difficult to distinguish on the damaged tissues conidiophores and conidia at the filiform end at this magnification with a binocular magnifying glass. <b><i>Alternaria tomatophila</i></b> <b>Alternaria leaf spot (early blight)</b>
Alternariose-Tomate-WATT1
Appearance of conidia of <b><i>Alternaria tomatophila</i></b> observed under a light microscope. The spores of this fungus, multicellular and elongated, are solitary and provided with a filiform hyaline prolongation. <b>Alternaria leaf spot (early blight)</b>
Detail of a short <b><i>Alternaria tomatophila</i></b> conidiophore emerging from damaged leaf tissue. <b>Alternaria leaf spot (early blight)</b>